Library hard crashing when computing BBFG permanent with a 0x0 matrix about thewalrus HOT 4 CLOSED

or, alternatively, @GregoryMorse , you are most welcome to do a PR fixing it and become a contributor! You can use the example of how this is solved in the hafnian function here

from thewalrus.

Thanks for bringing this to our attention @GregoryMorse. As of the latest release (v0.18.0), The Walrus no longer uses libwalrus for any calculations. The function corresponding to thewalrus.libwalrus.perm_BBFG_complex is now thewalrus.perm.

The equivalent code to your example above would be:

import numpy as np
import thewalrus as tw

mat = np.zeros((0, 0))+np.zeros((0, 0)) * 1j
tw.perm(mat, method="bbfg")

With that said, it seems like this function has the same issue, so a fix would still be needed to make sure that the permanent function returns 1 for an empty matrix. We will look into fixing this in an upcoming release!

from thewalrus.

Hi @GregoryMorse --- Could you tell us which version of thewalrus are you using?

from thewalrus.

Hi @nquesada, version 0.16.1, the one in PyPi

from thewalrus.